<template>
	<!-- 富文本组件 -->
	<div>
		<el-upload :action="uploadUrl" :before-upload="handleBeforeUpload" :on-success="handleUploadSuccess"
			:on-error="handleUploadError" name="file" :show-file-list="false" :headers="headers" style="display: none"
			ref="upload" v-if="this.type == 'url'">
		</el-upload>
		<div class="editor" ref="editor" :style="styles"></div>
	</div>
</template>

<script>
import Quill from "quill";
import "quill/dist/quill.core.css";
import "quill/dist/quill.snow.css";
import "quill/dist/quill.bubble.css";
import { getToken } from "@/utils/auth";

export default {
	name: "Editor",
	props: {
		/* 编辑器的内容 */
		value: {
			type: String,
			default: "",
		},
		/* 高度 */
		height: {
			type: Number,
			default: null,
		},
		/* 最小高度 */
		minHeight: {
			type: Number,
			default: null,
		},
		/* 只读 */
		readOnly: {
			type: Boolean,
			default: false,
		},
		/* 上传文件大小限制(MB) */
		fileSize: {
			type: Number,
			default: 5,
		},
		/* 类型（base64格式、url格式） */
		type: {
			type: String,
			default: "url",
		}
	},
	data() {
		return {
			uploadUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
			headers: {
				Authorization: "Bearer " + getToken()
			},
			Quill: null,
			currentValue: "",
			options: {
				theme: "snow",
				bounds: document.body,
				debug: "warn",
				modules: {
					// 工具栏配置
					toolbar: [
						["bold", "italic", "underline", "strike"],       // 加粗 斜体 下划线 删除线
						["blockquote", "code-block"],                    // 引用  代码块
						[{ list: "ordered" }, { list: "bullet" }],       // 有序、无序列表
						[{ indent: "-1" }, { indent: "+1" }],            // 缩进
						[{ size: ["small", false, "large", "huge"] }],   // 字体大小
						[{ header: [1, 2, 3, 4, 5, 6, false] }],         // 标题
						[{ color: [] }, { background: [] }],             // 字体颜色、字体背景颜色
						[{ align: [] }],                                 // 对齐方式
						["clean"],                                       // 清除文本格式
						["link", "image", "video"]                       // 链接、图片、视频
					],
				},
				placeholder: "请输入内容",
				readOnly: this.readOnly,
			},
		};
	},
	computed: {
		styles() {
			let style = {};
			if (this.minHeight) {
				style.minHeight = `${this.minHeight}px`;
			}
			if (this.height) {
				style.height = `${this.height}px`;
			}
			return style;
		},
	},
	watch: {
		value: {
			handler(val) {
				if (val !== this.currentValue) {
					this.currentValue = val === null ? "" : val;
					if (this.Quill) {
						this.Quill.pasteHTML(this.currentValue);
					}
				}
			},
			immediate: true,
		},
	},
	mounted() {
		this.init();
	},
	beforeDestroy() {
		this.Quill = null;
	},
	methods: {
		init() {
			const editor = this.$refs.editor;
			this.Quill = new Quill(editor, this.options);
			// 如果设置了上传地址则自定义图片上传事件
			if (this.type == 'url') {
				let toolbar = this.Quill.getModule("toolbar");
				toolbar.addHandler("image", (value) => {
					if (value) {
						this.$refs.upload.$children[0].$refs.input.click();
					} else {
						this.quill.format("image", false);
					}
				});
			}
			this.Quill.pasteHTML(this.currentValue);
			this.Quill.on("text-change", (delta, oldDelta, source) => {
				const html = this.$refs.editor.children[0].innerHTML;
				const text = this.Quill.getText();
				const quill = this.Quill;
				this.currentValue = html;
				this.$emit("input", html);
				this.$emit("on-change", { html, text, quill });
			});
			this.Quill.on("text-change", (delta, oldDelta, source) => {
				this.$emit("on-text-change", delta, oldDelta, source);
			});
			this.Quill.on("selection-change", (range, oldRange, source) => {
				this.$emit("on-selection-change", range, oldRange, source);
			});
			this.Quill.on("editor-change", (eventName, ...args) => {
				this.$emit("on-editor-change", eventName, ...args);
			});
		},
		// 上传前校检格式和大小
		handleBeforeUpload(file) {
			const type = ["image/jpeg", "image/jpg", "image/png", "image/svg"];
			const isJPG = type.includes(file.type);
			// 检验文件格式
			if (!isJPG) {
				this.$message.error(`图片格式错误!`);
				return false;
			}
			// 校检文件大小
			if (this.fileSize) {
				const isLt = file.size / 1024 / 1024 < this.fileSize;
				if (!isLt) {
					this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
					return false;
				}
			}
			return true;
		},
		handleUploadSuccess(res, file) {
			// 如果上传成功
			if (res.code == 200) {
				// 获取富文本组件实例
				let quill = this.Quill;
				// 获取光标所在位置
				let length = quill.getSelection().index;
				// 插入图片  res.url为服务器返回的图片地址
				quill.insertEmbed(length, "image", process.env.VUE_APP_BASE_API + res.fileName);
				// 调整光标到最后
				quill.setSelection(length + 1);
			} else {
				this.$message.error("图片插入失败");
			}
		},
		handleUploadError() {
			this.$message.error("图片插入失败");
		},
	},
};
</script>

<style>
.editor,
.ql-toolbar {
	white-space: pre-wrap !important;
	line-height: normal !important;
}

.quill-img {
	display: none;
}

.ql-snow .ql-tooltip[data-mode="link"]::before {
	content: "请输入链接地址:";
}

.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
	border-right: 0px;
	content: "保存";
	padding-right: 0px;
}

.ql-snow .ql-tooltip[data-mode="video"]::before {
	content: "请输入视频地址:";
}

.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before {
	content: "14px";
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="small"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="small"]::before {
	content: "10px";
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="large"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="large"]::before {
	content: "18px";
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="huge"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="huge"]::before {
	content: "32px";
}

.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
	content: "文本";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="1"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="1"]::before {
	content: "标题1";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="2"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="2"]::before {
	content: "标题2";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="3"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="3"]::before {
	content: "标题3";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="4"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="4"]::before {
	content: "标题4";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="5"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="5"]::before {
	content: "标题5";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="6"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="6"]::before {
	content: "标题6";
}

.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
	content: "标准字体";
}

.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="serif"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="serif"]::before {
	content: "衬线字体";
}

.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="monospace"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="monospace"]::before {
	content: "等宽字体";
}</style>
